Brett,

I am on the Northern beaches. Would love to see you JJ1800 in action!!!!


Mav

I have just ordered my JJ1800. Should be here in a few weeks. I will post my experiences and first impressions

Mav

Heads up happy JJ owners

Just heard about the Jet Joe turbine wheel that lost blade(s) at full monty [&:][:@][:-] It only takes one blade lost at 160,000rpm and balance and integrity is totally lost instantly. Luckly it was in the air safely away from any humans, babies or dogs etc, etc. just trashed the turbine and put the jet plane at risk due to the dead stick.

So Joe used to make his CCs with SS instead of inconel that didn't last long [&o][&o] a very bad call for early customers like me. I'd have a guess the inconel being used in China is scrap[8D] recovered, for casting which isn't then really inconel at all [>:]due to the missing rare essential metals. Also the balancing by taking deep cuts into the turbine wheel and ignoring the sacrificial ring is just the poorest engineering practice.

Heads up warning this can occur in the pit area at start up! so follow best practice guide rules and keep any watchers well away. Metal fatigue and poor casting voids is only detected through NDT and there isn't any QA/QC in Joes factory.

Yeh I was a JJ owner, posted on this thread right at the front pages with Easytiger about myJJ turbines and paid $4000 to Joe. I'm a little wiser now, a GTBA member, owner/builder who has seen the light or that should be seen the inner snafiu metal workmanship first hand.

Paul

FYI from post 99 in this thread

JetJoe jj1800 1400!

How did old posts end up here at the end?

DW_Crash

Goldcoast,

I am sure he will replace the rear cone. When did you receive your turbine? Mine is due here in a few weeks. The flightworks pumps are used world wide by other manufactures also, so this is not a JJ pump specifically.

Let us know how the engines run please. Can you weigh the JJ1800 and post also.

Mav

I flew my Topgun Mig29 powered by a JJ1800 and it flew very well. Our club field is 800 feet, all grass and it took a little less than half to get airborne. My airplane full of fuel weighs in at 22lbs. I'm using a Tam bifurcated pipe. I'm not sure how much thrust I'm getting but it sure is a lot to be able to fly my airframe with authority at the weight I described. I use to have a Wren 54 mk11 in it and performance was marginal so I put a JJ1800 in it. Overall, I'm completely satisfied with my engine. I bought mine from Gabe and Mark, the US Jetjoe reps.
Steve

where can i get bearings in india can any one help me

Hello ajay.

You can find there http://www.grw.de/english/frame.htm -> worldwide service

JJ1800

Anyone know how to remove the bendix clutch, can it be used again on another motor

Drive out the silver pin in the clutch this will let the outer part slide off. Use a pinion gear puller to remove inner part of bendix from motor shaft.

Jet joes

I really thought this thread was quiet with JJ turbine fin parts letting go at 160k rpm, but there is a bit of life here yet. Then I've thought it over and its much like having a MDS, we all know their were crap right early on but until it dies or dead sticks into terra firma run it. OK but bits coming out at 160k the force is monumental so in the pits at start up, like they say on Hill Street Blues you know the risks be careful out there.

Xairflyer

As suggested use a puller it will distroy the old can motor, not problem, refix with preferred liquid metal onto new motor pinion

Paul

Still hammering away at Jet Joe and improving your reputation, huh Paul. Some things never change.

FWIW - Here in the U.S. , the JJ's popularity grows by leaps and bounds.

Glad to see you back Paul, keep up the good work.

> Jim

"FWIW - Here in the U.S. , the JJ's popularity grows by leaps and bounds. "

Really? I'm curious, how did you arrive at that conclusion?
I've only seen two JJ and neither would run up to full power, one shutting down because something let go inside.
If you love tinkering, JJ's for you.
If you want to fly on a regular basis, well, you get the idea.
BRG,
Jon

Cant seem to get the clutch to lineup properly, tends now not to release and at about 25,000, the ecu senses the motor is still engaged and shuts it down. Have moved it in and out with no luck.

Xairflyer,

Try unscrewing the cap that holds the starter motor. That is how you adjust the clearance. Also, don't use the ECU to set-up the starter clutch. Quickly plug and unplug your battery directly to the starter motor. That way you can try small adjustments to set it up. It took me about 10 minutes and 7 or 8 tries to get the clearance right. There is a bit of slop in the JetJoe starter bendix. I found this aided and compenstated for misalignments etc.

DW_Crash.

Tell me Jim,
How many flights on your JetJoe?

Can you quantify this statement.

The in and out clearance is not the problem that is easy to get right, it seems to be not lined up streight, but very difficult to see by the eye.

Well now it comes to moving the legs in the cowl. Grab and yank....

Unfortunatly it is not as easy as that, been at it all day yesterday, it is very difficult to see if it needs to go up, down, left, right etc

It might be easier to remount the starter with new mounting holes.

I mounted my own starter motors. What i did was to place the cowl on a flat table. Place masking tap where the legs of the motor contact the cowl. Then, using a square, eyeball the stater motor being square to the table from several directions. Now, mark the center of each leg on the masking tape. Measure the marks from table top. Average then out and remark this new location on the masking tape. Drill new holes at these locations. Done carefully, I found it get the starter darn near perfectly square to the impellor.

Good luck,
DW_crash

rcdriver22, tredstone, rcguy

Don't ever go away guys. I find basher mentality such as yours, both pathetic, and amusing ! You really contribute a lot to this thread.

Keep up the good work.

> Jim